Lemon is a traditional part of mediterranean accompaniments for seafood. Being from Greece I associate lemons and seafood naturally. We're not like the French who make wonderful butter sauces, not like the English who batter and fry, not like Indian who bury in curry.
The meditarrean logic on seafood is the simpler the better. Lemon is like a magnifying glass on flavors. It works best when used on a very simple preparation of seafood like seasoned with salt and pepper, and grilled. It is only meant to enhance, not mask.
Try this simple dressing on your next fillet.
-2 lemons juiced
-tbsp chopped parsley
-salt
-evoo
In a FP or by hand, which the juice, parsley, and salt until well incorporated. Slowly and while whisking drizzle the olive oil into the bowl, constantly whisking until it emulsifies. Drizzle on a filet and enjoy.